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Well‐Defined Cesium Benzotriazolide as an Active Catalyst for Generating Disubstituted Ureas from Carbon Dioxide and Amines
Author(s) -
Truong Cong Chien,
Kim Jin,
Lee Yunho,
Kim Yong Jin
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601320
Subject(s) - carboxylation , catalysis , chemistry , alkali metal , caesium , carbon dioxide , inorganic chemistry , crystal structure , organic chemistry
The reaction of alkali metal carbonates with various azole compounds produced a new series of alkali metal azolides, and they were applied as active catalysts for the production of disubstituted ureas from the carboxylation of various amines with CO 2 . Among them, cesium benzotriazolide (Cs[BTd]) was found to be the most active for the carboxylation reaction and was structurally characterized by single‐crystal X‐ray diffraction. The crystal structure of highly hygroscopic Cs[BTd] was found to be [BTA] ⋅⋅⋅ Cs[BTd], which explains why it is a water‐tolerant active species for this carboxylation reaction, leading to a maximum turnover frequency of 344 h −1 as well as high recyclability even after five successive runs.